my calculator doesn't math

You might think that 2 + 3 * 5 = 17 but according to my calculator you would be wrong. The correct answer is 25. As you take a second to sift through the dark recesses of your first grade memories you might wish to argue with me but my confidence in this answer exists because the answer was derived using the Windows™ calculator.

Okay, you're right. The answer is really 17 but the calculator I used to complete an EVSI problem with simple fractional arithmetic gave me much different answers than were correct. Unfortunately, the simple calculator I used does not obey the order of operations given by the basic axioms of Math. Rather it obeys its own order of operations being the order of entry.

If I would have known that certain calculators that do not have basic data structures, such as a stack, only work left to right, I could have saved myself the grief of wondering how I could have forgotten my arithmetic. So let this be a warning to all of the unsuspecting users who have been fortunate in life to have a calculator that knows how to math that not all of them behave the way you would hope.